26 lines
719 B
Markdown
26 lines
719 B
Markdown
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# 23-haskell-maybe-either
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This example shows intermediate Haskell request building with `Maybe` and `Either`.
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It includes:
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- optional fields read through `Maybe`,
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- required fields upgraded from `Maybe` into `Either` errors,
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- validation for rollout strategy and canary percentage, and
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- a test suite run by `nix flake check`.
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Useful commands:
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```bash
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nix develop
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cabal run
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cabal run -- service=api env=production replicas=3 strategy=canary canary=10 owner=platform
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cabal test
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nix build
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./result/bin/mini-release-request service=api env=production replicas=3 strategy=canary canary=10 owner=platform
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nix run . -- service=api env=production replicas=3 strategy=canary canary=10 owner=platform
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nix flake check
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```
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